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Douglas A. Olsen

United States Geological Survey

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Feeding habitat characteristics of the great blue heron and great egret nesting along the Upper Mississippi River, 1995-1998

2004 Waterbirds
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Effects of Landscape Composition and Wetland Fragmentation on Frog and Toad Abundance and Species Richness in Iowa and Wisconsin, U.S.A.

1999 Conservation Biology
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